A 57 70 66 27 3 65 15 86 64 49 11 16 34 57 61 29 26 73 10 45 71 11 98 12 43 46 13 64 88 14 19 22 15 14 53 16 14 59 17 11 94 18 34 18 19 68 68 20 39 62 B. 2.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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Here is a link to a data set concerning treatment groups A and B.

Before performing a t-test to determine if the two groups are different, researchers must first ascertain if the variance in the two groups is the same using an F test.

Indicate whether the hypothesis below is the null or alternate hypothesis for the F test.

 The variance in group A is equal to the variance in group B  

Calculate the F statistic for this data set and report it in the box below, rounded to two decimal places.

 

Use the formula =(1-(f.dist(F, df1,df2,true) in Excel to calculate the P value for the F statistic, and report it in the box below. Do not use the rounded value for F when calculating the P value. Use the value in the spreadsheet that has not been rounded.

 

Based on this p value, would you recommend using a Student's t test or a Welch's t test to determine if the two treatment groups have different means? Enter either Student's or Welch's in the box below.

 

A
57
70
66
27
3
65
15
86
64
49
11
16
34
57
61
29
26
73
10
45
71
11
98
12
43
46
13
64
88
14
19
22
15
14
53
16
14
59
17
11
94
18
34
18
19
68
68
20
39
62
B.
2.
Transcribed Image Text:A 57 70 66 27 3 65 15 86 64 49 11 16 34 57 61 29 26 73 10 45 71 11 98 12 43 46 13 64 88 14 19 22 15 14 53 16 14 59 17 11 94 18 34 18 19 68 68 20 39 62 B. 2.
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Hypothesis Tests and Confidence Intervals for Equality of Variances
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